How many teenagers are there in Dallas Texas?

looking in http://en.wikipedia.org/wiki/Demographics_of_Dallas%2C_Texas we can find some data from census of 2000.We cn find that:"In the city the population was spread out with 26.6% under the age of 18, 11.8% from 18 to 24, 35.3% from 25 to 44, 17.7% from 45 to 64, and 8.6% who were 65 years of age or older. "I use this data, using Microsoft excel, to find a function telling relative population by age.

So there are about 13% of the population between 13 e 20 years.

This would be approximately 160.000 people.